Balance.



E. SARTGRIUS.

nALANcB. y AYPLIOATION FILED PEB. 24, 1913.

1,1 32,880. Patented Mar. 23, 1915.

F.ey. l, ffy. 2. ffy. 3.'

1 s J .f1-

ERICH SARTORIUS, 0F GTTINGEN, IGERMANY.

BALANCE.

Specification of Letters Patent.

Patented Mar. 23, 1915.V

Application tiled February 24, 1918. Serial No. 750,362.

['0 all whom it may concern: i

Be it known that I, ERICH SARTORIUS, a subject of the Emperor of Germany, residing at Gttingen, German have invented certain new and useful mprovements in Balances, of whiclrthe following is a specilisation.

This invention relates to balances and has for l its primary object to provide an irnproved balance wherein certain defects inherent in devices of this description as hitherto constructed are avoided.

A further object of the invention is to provide means whereby a more ready weighing operation may be effected than has hitherto been practicable.

A still further object is to provide a balance Vwith means for relieving the terminal knife'edges of the weight of the scale pans or their equivalentvwhen desired and whereby undue oscillations on the part of the scale beam may be avoided.

Another object of the invention is to provide a simple and efficient form of releasing and arresting mechanism for the scale beam.

It is usual to operate the releasing .and arresting mechanism by means of a rod locat-ed in the main column of `,the balance, suitable guides being provideoL at the top and base of the column for holding the operating rod in position.

The raising and lowering of the balance beam effected by the releasing and arresting mechanism and also-the raising and lowering of the terminal stirrups or pendants into their respective knife edges by the action of the rod located in the column of the balance is effected by a pair-of arresting arms or brackets which are either pivotally mounted at their inner ends on the column of the balance and raised or lowered by-.fy. suitable under frame or bracket secured to the operating rod or the two arresting arms are constituted by a rigid cross bracket connected directly to the operating rod and eX- tending outwardly on either side thereof.

The operating rod must under all circumstances be held tightly in its guides so that although free longitudinal displacement of the rod can be effected, angular displacement of the operating rod is avoided, inasmuch as angular displacement of the operating rod prevents simultaneous operation of the terminal stirrups and pendants. The operating rod must therefore under all circumstances beso guided that'the balance beam and the terminal pendants are raised equally on both sides. This will be the case if when the terminal pendants and the scale beam are reset in position on their knifey c dges the pointer remains at zero on its scalo when the balance is in equilibrium or when that arm of the scale beam carryin the greater weight immediately moves ownvward upon the scale beam being rendered free to oscillate. Accuracy of operation in this respect cannot usually be' maintained in balances as heretofore constructed afterthey have been in use for a short time and eir-l periments have shown that this defect in: caused by wear in the guides or supports for the operating rod of the arresting mechanism, since when this operating. rod becomes loose from-wear an angular displacement of the rod and also of the relieving bracket is liable to, occur particularly in cases in which the longitudinal displacement of the rod is effected byvmeans of a cam or eccentric since with such an arrangement the lower end of the operating rod iz. forced by the action of the cam. laterally against one sideof the guide or support in the main column of the balance.v This lateral movement of the operating rod pro-` duces a corresponding tilting of the arrest-l ing arms to which the operating rod is at-I tached with the result that these I.arms are raised more on oneside than onthe other and uniform vertical movement `of thel resting device is no longer assured.

The invention is illustrated in the accompanying drawings of which-- Figure 1 is a view partly in section of a scale or balance embodying the present in` vention. Figs. 2, 3 and 4 are views in front arresting mechanism the movement''f the operating rod vertically downward so as to replace the pendants on their Arespe'ctiv afin."

kiffe will cause one of the pendants to be ced in position before the other due to the tact that the pendants, when the scale b2 i rests in its arrested position, are separat fl trom the knife edges by different distances.' The question as to which of the l-*nile edges will be' first engaged by this pen-dant will depend upon whether the operating rod is tilted toward theright as shown in Fig. 2 or toward the left as shown in Fig. 2, the eifect being in either case that as thescale beam is released it will be de- 'llected by the pendant first coming into engagement with the corresponding terminal lrnife edge with the result that the pointer of the balance will, even though the scale beam would be in equilibrium when both the pendants were engaged by their knife edges, be deflected from its position due to the pendants not being simultaneously set in position. A. wrong indication would thus be given by the pointer of the balance even though the loads in the two scale pans were exactly equa-l to one another. lf, however, this is not the case, the initial release of the scale beam would not necessarilycause the pointer to move in a direction correspond ing to the one of balance between the two loads for the reason already explained, namely that the scale beam is not necessarily truly horizontal when it is released and the pendants engage with their respective knife lt will new be seen that 'a wron indication. may he given by the pointer o the balance when the arresting mechanism is operated to tree the scalo beam and the latter is moreover liable to' violent and iniurious deflections due to the two pendants not simultaneously engaging with their respective knife edges, the latter disadvantage occurring in both types of arresting.. mechanism above described.

Referring new to Figs. 2 to 4, which illustrate above stated a preferred form'of the invention, the arresting mechanism-is indicated as comprising two arresting arms l. pivotally mounted 'upon the head of the column 2 of the balance. The head ot this column is provided with two lugs 3 upon each of which is pivotally mounted a lever t, the pivots being indicated at 5.

The arresting arms l arev mounted in a recess in the head of the column as shown in Figs. 3, 4 and 5, this recess being provided with a pair of vertical grooves (l which serve to guide the vertical movement of the open ating rod 7. The upper end of the rod 7 is provided with a transverse pin 10 the outer ends of which liev Within the grooves 6, the pin l0 also forming the means of attachment of the inner end of the levers 4 of the operating rod clearly shown 'in Figs. 5 and 6, the inner ends of the levers l being forked as clearly illustrated. The lower end of the operating rod T is provided with the usual eccentric 9 for causing the upward and downward movements of the operating rod and in order to avoid wear, the slots 6 may ii desired be provided with sliding members secured to the pin l0.

Referring now to the modification shown in Fig. 7 the levers 4 are in this case arranged vertically one above the other, the

lower lever 4 being provided with a curved or hemispherical projection 1l adapted to engage with the lower tace of the upper lever 4. The operating rod 7 in this'dase engages with the lower lever 4f and its movement is transmitted through the projection ll to the upper lever as will be clearly seen from an inspection of Fig. 7, the points ol contact of the upper end of the operating rod 7 and ot the projection ll being arranged to be such that their distances from the pivots of the tivo levers 4 are always equal to one another.

In the modification illustrated in Fig. 8, the operating rod 7 is connected by means of a pin 12 to the upper lever 4, the inner end of this lever being cylindrical in form and adapted to engage with the inner end 13 of the other lever i so that when the operating rod 7 is moved in a downward dirtion both of the levers 4 will be moved to the same extent.

I claim as my invention l. The combination in a balance ofv a scale beam, a device for renderingsaid scale beam operative and inoperative as desired,

pivotally mounted members for eli'ecting the vertical displacement of said device and.

means for effecting the simultaneous and equal movement of said pivotally mountedv members about their pivots.

2. The combination in a balance of a scale beam, a device for rendering said scale beam operative and inoperative as desired, a number of'pivotally mounted levers for actuating said device, a vertically movable member for actuating said levers effecting the simultaneous and equal movement of said levers independent of wear on said member.

3. The combination in a balance of a scale beam, a device for permitting and arresting the oscillation of said beam, a number of pivotally mounted levers for effecting the operation of said device`and means for effooting .the simultaneousactuation of said levers regardless of Wear.

4. The combination in a balance of a scale beam, a column for supporting said scale beam., a device mounted in the headbf said column for arresting the oscillations of said scale beam, pivotally mounted levers located on tbe underside of said device and means for effecting a. simultaneous and equal movement of said levers.

5.',The combination 1n a balance of a scale beam, a column for supportingY said wenn n device mounted on said column for arresting the oscillations ot' said beam n, nuxnllor of' levers pivotzilly mounted on said column and adapted to actuete said device, nn opvrnting rod located within said oolumn and operntirrly connected to sind levers and means sitinitod at the baise of snid column for actuating said operating rod.

(Si The combination in n lnilunee of a smi@ benin. a Column tor supporting said soule benin :i device liirnlrd :it ille liond of said ooln'nn'i for arresting tho movement of the` scale beam, o 'number of pivotnlly mounted levers located nil the upper portion of the column for ruinimitting motion to tlie arresting device and. nnxuns for insuring that the two sides or the arresting device nre maintained :it the seine level during its operation.

7. The eoznbirnition in n balance of n smile beam. pivotolly mounted members for inw resting the oscillations ol'v said benin and pirotalljY mounted levers for reflecting the actuation of said members.

The combination in a balance of a soule boum. n supporting eolnnin therelor, a. pair of :irnos pirotaliy mounted on said lfollnnn for arresting the oscillations of said benin and n pair of levers also pivotully mounted on said column for efecting tlny actuation of said arms.

9. The combination in a balance ol n scale beam, a eolnrnn ior supporting said scalo beam, :1, pair of pivot-ed arms located et the head of seid column for arresting the Inovement of sind scale benin, n pair of pivoted levers located underneath said arms and means for etfecting a corresponding angular displacement of each of said levers to actuate said arms.

10. The combination in a balance of a .Houle beam, n. column for supporting said benin, a pair of pivotully mounted arms mounted in the head of said column, a pair of pivot-:illy mounted levers carried in ,lugs attached to suid Column, mi operating rod located within seid column for effect-ing the rotation of said pivoted levers and means lor guiding,r the inner ends of the pivotully mounted levers during operation.

ll. The omlnntion in :i balance of a mile beam,y a column for supporting snid been), a pair of arms lnvotully mounted in the head of said column. a pair of levers pirotzilly mounted in ings adjarent to the lininl osnid column and adapted to engage nl.. their outer ends with the pivotnlly n'iounted arms, an operating rod located mithin said column, :i connecting link betnren tln inner ends of said levers and sold oi'lnneeting rod nml :nlzipteil to more Within :1 vri-tical groove in tlie hond ol suid column und :in eerrntrio device located in the bose ot smid column for infecting tlleopernt-ion of sind operating rod.

l2. 'The-colnlnnution in :i balanc of a smile lwmn5 :t rolurnn for supporting said benin. n rod located within the interior of :zuid column for effecting' tile operation of un arresting device, n pair of pivotod levers operated by said rod ond menus for insuring that the movement ot' one lever is accompanied by a corresponding movement ot the other lever.

In testimony whereof I have hereunto set my hond in presence of two subscribing Witnessesl.

ERICH SARTORUS.

Witnesses:

l?. A. FIELMYER, GUs'rAv BUssE. 

